Error when attempting to alter my site's files in htdocs

[mydogisfast]

epiz_31502712

(Website/account doesn’t matter, it shows up on all of my infinity free sites.)

Error Code: Error during FTP upload, permission denied at “/htdocs/index2.html”
(please share the FULL error message you see)

I am new to InfinityFree, and all of the websites/accounts that I attempt to create refuse to let me upload or alter files from the file manager. Not sure why it claims to have permission issues as I am the site owner. Would anyone know how to fix this?

[KangJL]

Check your directory permission level. If it is less than 600, it will be better to create a new hosting account

[Admin]

To start working on your new hosting account, please DELETE the index2.html file, and then upload your own web pages. Editing the index2.html file is not possible.